I went looking through foundations team package bug reports with this same error message and only found one:

[ 10:39AM 10167 ] [ bdmurray@impulse:/misc/bug-attach ]
$ for atlog in $(find . -name VarLogDistupgradeApttermlog.gz); do zgrep "APT had planned for dpkg to do more than it reported back" $atlog; done
[ 10:43AM 10168 ] [ bdmurray@impulse:/misc/bug-attach ]
$ grep -r "APT had planned for dpkg to do more than it reported back" *
apt/bug-1647638/Description.txt:W: APT had planned for dpkg to do more than it reported back (4 vs 6).
debconf/bug-1696989/Description.txt:W: APT had planned for dpkg to do more than it reported back (40 vs 44).

To get a clearer log, run 'apt-get upgrade' before trying the reproducer, otherwise apt output might be clobbered by other package installs - the warning should still be there though, just with different numbers.

That's just a minor cosmetic issue IMO. It does not affect the functionality at all. There's just a mismatch between what apt thought dpkg would do and what dpkg actually did, because dpkg took some shortcuts.